the panel
The "world" where the black knob represents the aircraft position. The block with the two small nylon wheels represents the NDB. The string to the aircraft pulls the synchro to generate the ADF indication.
the rear of the "world" with the synchro in the left lower corner for the southwest VOR and the synchro in the center again the NDB. The potmeter generates the DME reading and the ILS G/S indication.
All pretty ingenious.